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What is Concordance Index (C-Index)

Chapter 146
Encyclopedia of Data Science and Machine Learning
The c-index is a measure of rank correlation between the models’ predicted risk scores and the observed time points (in the test data). It can be thought as a generalization of Kendall’s correlation t tailored specifically for right-censored survival data.
Published in Chapter:
Challenges and Chances of Classical Cox Regression
Mengying Xia (Emory University, USA) and Leigh Wang (Northwestern University, USA)
Copyright: © 2023 |Pages: 12
DOI: 10.4018/978-1-7998-9220-5.ch146
Abstract
Cox regression is the method for investigating the effect of several variables upon the time a specified event takes to happen. It is also known as the proportional hazards regression because it is all revolved around survival analysis. The Cox proportional hazards (CPH) model is the most frequently used approach for survival analysis in a wide variety of fields. This article summarizes current research, especially its applications in the area of diagnosis and treatment of coronavirus disease 2019 (COVID-19). Also, the pros and cons of competitive machine learning (ML) models for targeting the same object will be presented.
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